Muffler bodies flare to 4” ends which are finished with legendary 4” SuperTrapp discs and a polished mounting ring A 2” diameter straight inner tube with sound-absorbing fiber cartridge 12 discs per silencer and closed end caps to gain 15% power and 12% torque It can be dimmed; 6 discs per silencer and closed end caps offer 86 dB at idle, quieter than stock, but with improved performance All necessary mounting hardware included Compatible with stock header tubes and SuperTrapp True Duals Made in the U.S.A.